Switch for electric circuits



A ril 27, 192

V. BREEZE v swncn FOR EL'ECTRIC cmcun's Filed June 1, 1922 2Sheets-Sheet 1 April 27, 1925.

V. BREEZE SWFI'CH FOR ELECTRIC CIRCUITS Filed June 1. 1922 2Sheets-Sheet 2 I I, i v '37 8 27 ll I If g3 )A'bfilV/YIM Qz/ q v Z5 v6:5 I I 1. T- 19 I Patented Apr. 27, 1926.

sszsze VICTOR BREEZE, F BRIGHTON, ENGLAND.

swrron ron nnncrnrc CIRCUITS.

Application filed June 1,

T 0 all whom it may concern:

Be it known that I, Vroron Bnnnzn, a subject of the King oi GreatBritain, and resident of Brighton, in the county of Sussex, England,have invented certain new and useful Improvements in or Relating toSwitches for Electric Circuits, of which the following is aspecification. V

This invention rclatesto electric switches more particularly of thepush-button type, and has for its object to provide aswitch of simpleconstruction applicable for use with inductive currents and wherein theinjuriouseliiects of arcing are prevented or reduced to a minimum.

The present invention comprises an electric circuit switch having fixedand movable contacts, wherein the contacts are mounted in a tubularsection of insulating material.

u'eierably provided with covering plates consisting of sheets oiinsulating material.

Two embodiments of the invention as applied to a start and a stop switchres )ectively are'illustrated by the accompanying drawings, whereinFigure 1 is a front elevation of a-start wit-ch having a. removablecover, Figure 2 the same with the cover removed, Figure 3 an invertedsectional plan of the same, while Figure 4 is a. front ele ation of astop switch, Figure 5 an inverted plan of the same, Figure 6 a sectionalplan of the same, and Figure? a side section of the same.

In these drawings 2 is the tubular section of insulatin material, 3, 3,the fixed stops or contacts and 4t, 4t the movable stops or contacts. 7and 8 are respectively the front and rear sheets of insulating material,9 and 10 are respectivelythe frontand rear portions of acasing, theportions being bolted together by screws and nuts 11.

The tubular section 2 of insulating mate rial is of semi-circularshapedesignated to fit-easily in the parts 9 and 10 of the casing andits lower portion is in the form of a diametrical wall adapted to restat each side on ledges 12," 12 formed in the casing. The upper portionof the tubular section 1 1s flattened at 13 to clear the screws 11,while the centre of its lower portion is troughshaped to receive abearing bracket 15 for a switch plunger 16, the. bracket being fixed inthe trough by a screw and nut 17. The bearing bracket 15 consists of asheet f n etel bent up and drilled to forn a bear ng The open ends ofthe tubular section are 1 22. Serial No. 565,177.

forthe slidable plunger 16. The plunger 16 is provided atitsfront endwith a push piece 18 of insulating material. In the rear end of the pushpiece l8 also bears one end oi a spring 19 the other end thereof bearingagainst the upright portion of the bracket The inner end. of the plunger16 has afeixed thereto a cross piece or bridge 20 on the ends of whichare rotatively mounted contact stop rollers i, 4, arranged in slots inthe ends oi the cross piece 1 20 and mounted on pins 21 oi which theends are secured to the cross piece at each side of the slot. plunger 16between washers 22 of insulating material. r I

-The fixed contact rollersflS, 8 are rotatively mounted on pins 23passing through the lower wall of the tubular section 2 oi insulatingmaterial. and securing thereto terminal blocks 2e, 241, having screws25, 2 5 for connecting thereto the ends ofthe leads. The ends of theleads are introduced through a cable carrying tube or boss screwec intothe opening 26 provided in the bottom of the casing: 10. The back of thecasing 10 is, proi-idedn'ith holes 27 whereby it can be fixed by screwsto any-suitable fiXt-ure. A boss 28 is provided in the front portion 9of the casing in which the push piece 18 is arranged to slide freely.

t will be seen that the tubular. section 2 extends into both the frontand back portions 9 and 10 of the casing which hold it between the frontand rear sheets 7 and 8 of insulating material. It willalso be seen thatas the insulating material is notsecured to the walls of the casing, thetubular section in which the fixed and movable con tacts are mountedindependently can be removed completely from the casing with thetubularsect-ion, this is facilitated by the lead terminals on the outside otthe tubular section being arranged to extend freely into a spaceprovided in the lower portion ot the casing. K p

In the start switch, the spring 19 is arranged to hold the movablecontacts 4, 4: normally out of engagement with fixed contacts 3,3,arranged behind themes in Figure 8, while in the stop switch the spring19 is arranged to hold the movable contacts l, l normally in engagementwith fixedcontacts 3, 3 arranged in front oi them as in Figure 7,

it The cross piece 20 is secured to the In order to facilitate aslightly rotatable contacting action between the milled surfaces of therollers 3, 3, and l, 4, the dis ances apart of the centres of each pairis made sutliciently dilierent to facilitate such rotary action.

lVhat I claim and desire to secure by Let ters Patent is A 1. Anelectric circuit switch comprising fixed and movable contacts andcircuit lead connec ing terminals, an open ended sect-ion of a tube ofinsulating material, a divided casing consisting of two detachabletubular portions each open at one end and closed at the other andadapted when secured together with their open ends in contact to encloreand support in position the section of the tube of insulating material,the movable contacts being opcratively supported independently of thecasing by he sides of the section of the tube oft insulating materialand the lead connecting terminals extending through the sides of thetube of insulating material into the casing.

2. an electric circuit switch comprising fixed and movable contactsarranged in an open ended section of a tube of semi-circular crosssection oi insulating material, a casing for enclosing and supporti gthe tube of insulating material and provided at its inner sides withoppositely disposed supporting ledges and terminals for connecting thecontacts to the circuit leads, the tired contacts,

extending through the base of the tubular section of insulating materialbetween the supporting ledges in the casing where they are provided withlead connecting terminals the supporting ledges also operating tosupport the tubular section in the'casing and prevent it rotatingtherein.

3. An electric circuit switch having in combination, a laterally dividedcasing consisting of two tubular portions each open at detachably heldthereon in the casing by the two portions.

l. An electric circuitswitch comprising a casing, fixed and movablecontacts operatively arranged within an open ended section of a: tube ofinsulating material, associated circuit connecting terminals, the tubeof insulating material being mounted in the cusing, a spring returnedmovable contact op erating plunger extending through an open ing in thefront of the casing and provided at its inner end with a pair ofcontacts having contacting surfaces consisting of the rims oi? rotatablewheels arra red to bridge the tired contacts which a v,.o havecontacting surfaces consisting of the rims of rotatable wheels.

5. An electric circuit switch comprising a casing-fixed and movablecontacts operatively arranged within an open ended section of a tube ofinsulating material, associated circuit connecting terminals, the tube01" insulating material being mounted in the ing, a sprii'ig returnedmovable contact opcrating plunger extending through an opening in thefront of the casing and prmxided at its inner end with a pair ofcontacts having contacting surfaces cons ing or the milled rims ofrotatable wheel arranged to bridge the fixed contacts which also havecontacting surfaces consisting ot the milled rims of rotatable wheels.

6. An electric circuit switch comprising a casing, tired and movablecontacts operatively arranged within an open ended section of a tube ofinsulating material, associated. circuit con resting tern'iinals, thetube of insulating material being mounted in the casings, a springreturned movable contact operating plunger extending through an openingin the front of the casing and provided atits inner end with a pair ofcon tacts having contacting surfaces consisting of the rims oi rotatablewheels arranged to bridge the fixed contacts also having contactingsurfaces consisting of the rims o't ro tatable wheels, the distanceapart of the axes of wheels of the lixed and movable contacts beingslightly diflerent.

In witness whereof I atfix my signature.

VICTOR- BREEZE.

